When you try to install an app on the entire farm, the app will only be installed on the main wiki, although the install plan computes for the entire farm

Steps to reproduce:

1. Search for an app (e.g.: FAQ)
2. Click "Installer sur toute le farme"
3. Notice how the install plan log resolves dependencies for all subwikis
4. Click on "Continue" to confirm and start the install
5. Wait for the confirmation message
6. Click the "Journal d'installation" tab and see that only the main wiki is listed (Installée sur les wikis suivants: Home)